<?php    
class System    
{    
    function currentTimeMillis()    
    {    
        list($usec, $sec) = explode(" ",microtime());    
        return $sec.substr($usec, 2, 3);    
    }    
}    
class NetAddress    
{    
    var $Name = 'localhost';    
    var $IP = '127.0.0.1';    
    function getLocalHost() // static    
    {    
        $address = new NetAddress();    
        $address->Name = $_ENV["COMPUTERNAME"];    
        $address->IP = $_SERVER["SERVER_ADDR"];    
        return $address;    
    }    
    function toString()    
    {    
        return strtolower($this->Name.'/'.$this->IP);    
    }    
}    
class Random    
{    
    function nextLong()    
    {    
        $tmp = rand(0,1)?'-':'';    
        return $tmp.rand(1000, 9999).rand(1000, 9999).rand(1000, 9999).rand(100, 999).rand(100, 999);    
    }    
}    
// 三段    
// 一段是微秒 一段是地址 一段是随机数    
class Guid    
{    
    var $valueBeforeMD5;    
    var $valueAfterMD5;    
    function Guid()    
    {    
        $this->getGuid();    
    }    
    //    
    function getGuid()    
    {    
        $address = NetAddress::getLocalHost();    
        $this->valueBeforeMD5 = $address->toString().':'.System::currentTimeMillis().':'.Random::nextLong();    
        $this->valueAfterMD5 = md5($this->valueBeforeMD5);    
    }    
    function newGuid()    
    {    
        $Guid = new Guid();    
        return $Guid;    
    }    
    function toString()    
    {    
        $raw = strtoupper($this->valueAfterMD5);    
        return substr($raw,0,8).'-'.substr($raw,8,4).'-'.substr($raw,12,4).'-'.substr($raw,16,4).'-'.substr($raw,20);    
    }    
}
?>